/*
 * Copyright (C) 2015 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect.testing.testers;

import static com.google.common.collect.testing.features.CollectionFeature.KNOWN_ORDER;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUES;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.AbstractMapTester;
import com.google.common.collect.testing.Helpers;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.MapFeature;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.junit.Ignore;

/**
 * A generic JUnit test which tests {@link Map#forEach}. Can't be invoked directly; please see
 * {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
public class MapForEachTester<K, V> extends AbstractMapTester<K, V>
{
    @CollectionFeature.Require(KNOWN_ORDER)
    public void testForEachKnownOrder()
    {
        List<Entry<K, V>> entries = new ArrayList<>();
        getMap().forEach((k, v) -> entries.add(entry(k, v)));
        assertEquals(getOrderedElements(), entries);
    }

    @CollectionFeature.Require(absent = KNOWN_ORDER)
    public void testForEachUnknownOrder()
    {
        List<Entry<K, V>> entries = new ArrayList<>();
        getMap().forEach((k, v) -> entries.add(entry(k, v)));
        Helpers.assertEqualIgnoringOrder(getSampleEntries(), entries);
    }

    @MapFeature.Require(ALLOWS_NULL_KEYS)
    @CollectionSize.Require(absent = ZERO)
    public void testForEach_nullKeys()
    {
        initMapWithNullKey();
        List<Entry<K, V>> expectedEntries = Arrays.asList(createArrayWithNullKey());
        List<Entry<K, V>> entries = new ArrayList<>();
        getMap().forEach((k, v) -> entries.add(entry(k, v)));
        Helpers.assertEqualIgnoringOrder(expectedEntries, entries);
    }

    @MapFeature.Require(ALLOWS_NULL_VALUES)
    @CollectionSize.Require(absent = ZERO)
    public void testForEach_nullValues()
    {
        initMapWithNullValue();
        List<Entry<K, V>> expectedEntries = Arrays.asList(createArrayWithNullValue());
        List<Entry<K, V>> entries = new ArrayList<>();
        getMap().forEach((k, v) -> entries.add(entry(k, v)));
        Helpers.assertEqualIgnoringOrder(expectedEntries, entries);
    }
}
